Multi Purpose Boost / Vacuum Gauge
Turbosmart TS-0701-1012 Electronic Vacuum/Boost Gauge 60 PSI Stepper Motor
Turbosmart TS-0701-1011 Electronic Boost/Vacuum Gauge 30 PSI Stepper Motor
Representative Photo, actual item may vary
What Is a Multi Purpose Boost / Vacuum Gauge?
A multi purpose boost/vacuum gauge is one of the most versatile and informative instruments you can add to your vehicle's instrument panel. Unlike a boost-only gauge, a combined boost/vacuum gauge tracks both sides of your intake manifold's pressure spectrum — negative vacuum pressure (measured in inches of mercury, or inHg) and positive boost pressure (measured in PSI). This dual-range capability makes it an indispensable tool for turbocharged and supercharged gasoline engines, where the engine regularly transitions between vacuum at idle and positive boost under load.
Why Vacuum and Boost Readings Both Matter
Many enthusiasts focus solely on peak boost numbers, but the vacuum side of the gauge tells an equally important story. Boost/vacuum gauges allow you to monitor fuel economy by reading throttle load — the higher the vacuum reading, the lighter the throttle application and the better the fuel efficiency. Beyond economy, vacuum readings are a valuable diagnostic window into engine health. A shaky or erratic needle can point to loose valve guides, leaky valves, or other running issues before they escalate into costly repairs.
On the boost side, keeping a close eye on your peak PSI is critical for any forced induction build. Overboosting can lead to piston and engine failure, while underpressure may indicate a boost leak, injector failure, or a damaged compressor wheel. A quality boost/vacuum gauge lets you catch these problems early and make informed tuning decisions — whether you're adjusting a wastegate, sizing a supercharger pulley, or dialing in an EFI system.
Mechanical vs. Electronic Gauges
Boost/vacuum gauges come in two primary drive types. Mechanical gauges obtain readings via a vacuum hose that runs directly from the gauge to the intake manifold — simple, reliable, and requiring no external power source. Electronic (or electric) gauges use a dedicated pressure sensor mounted at the manifold, sending a signal to the gauge face in the cabin. Electronic setups eliminate long hose runs through the firewall and are particularly popular in modern performance builds where a clean, integrated look is desired.
When selecting a gauge, consider your boost range carefully. For most stock-turbocharged gasoline engines, a gauge spanning -30 inHg to 15 or 30 PSI covers the full operating window. High-performance builds or diesel applications may require gauges with higher pressure ceilings. Dial size, backlighting, and bezel finish are also worth considering, as the gauge becomes a permanent part of your cockpit.
Top Brands in Multi Purpose Boost / Vacuum Gauges
Holley is a legend in American performance, and their boost/vacuum gauge lineup lives up to the brand's reputation for precision and integration. Holley's EFI-compatible gauges communicate via CAN-bus with Terminator, HP, Dominator, and Sniper ECUs — making them a natural fit for any Holley-powered build — while their standalone analog-style gauges bring the same quality to carbureted applications.